19491253782 has 288 divisors, whose sum is σ = 54670226688. Its totient is φ = 4507747200.

The previous prime is 19491253777. The next prime is 19491253783. The reversal of 19491253782 is 28735219491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19491253783) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 63489273 + ... + 63489579.

It is an arithmetic number, because the mean of its divisors is an integer number (189827176).

Almost surely, 2^19491253782 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19491253782, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27335113344).

19491253782 is an abundant number, since it is smaller than the sum of its proper divisors (35178972906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19491253782 is a wasteful number, since it uses less digits than its factorization.

19491253782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 374 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The spelling of 19491253782 in words is "nineteen billion, four hundred ninety-one million, two hundred fifty-three thousand, seven hundred eighty-two".